Colm Meaney allows the Beatles to exist even after they used the phrase "Blue Meanies" in Yellow Submarine. Although he could retroactively wipe them from existence in all past, present and future dimensions, just by using his jaw muscles.

It was Colm Meaney who convinced the filmmakers to change his character for all three of the Barrytown Trilogy movies (in the novels, it's the same character). This was done because for Colm to play the same character in three films would overload the screen due to maximum awesomeness.